text: #!/usr/bin/python3
  def max_integer(my_list=[]):
      "finds the biggest integer of a list"
  
      "if the list is empty, return None"
      if len(my_list) == 0:
          return (None)
  
      "find biggest int"
      biggest = my_list[0]
      for i in range(len(my_list)):
          if biggest < my_list[i]:
              biggest = my_list[i]
  
      return (biggest)
  